Deformed halo of 929F20

Research output: Contribution to journalArticle


Using a simple model based on the knowledge of spherical and deformed Woods-Saxon potentials, it is shown that the recent observation of halo phenomena in 29F can be interpreted as evidence for the prolate deformation of the ground state of 29F. The prolate deformation is the result of the shell structure, which is unique in one-neutron resonant levels, in particular near degeneracy of the neutron 1f7/2 and 2p3/2 resonant levels, together with the strong preference of prolate shape by the proton number Z=9. On the other hand, in oxygen isotopes spherical shape is so much favored by the proton number Z=8 that the presence of possible neutron shell-structure may not make the system deformed. Thus, the strong preference of particular shape by the proton numbers 8 and 9, respectively, together with a considerable amount of the energy difference between the neutron 1d3/2 and 2s1/2 orbits in oxygen isotopes seems to play an important role in the phenomena of oxygen neutron drip line anomaly, as was suggested by H. Sakurai et al. in 1999.


External organisations
  • University of Tokyo
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics


  • Deformed halo, Oxygen neutron drip line anomaly, Prolate deformation of F-isotopes, Shell-structure of weakly-bound neutrons
Original languageEnglish
Article number136116
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 2021
Publication categoryResearch